Our Clogged Kitchen Sink

For about three months now, we've been having some minor issues with our sink. We've been telling our landlord about what's going on but she keeps on telling us to wait further as she still have no budget for repair. It's been almost three months now since we first told her about our clogged kitchen sink but we still didn't hear anything from her till now. I browsed through the internet and have found one site that sells out cheap and affordable vessel sinks, and I guess what I'll do is just to purchase it online through my own money and just have it refunded. I'll just gonna ask my landlord to just deduct the amount I'll gonna shell out for the vessel sink from our next month's rent. I hope she'll consider that.